Is Soy Sauce High in Histamine?

Michael Eisenwasser 6 min read

You avoided the obvious things. No wine, no aged cheese, no leftovers. But then you had a stir-fry or some takeout and something was off. Soy sauce is often the ingredient people don't think to flag. It gets lost in a dish, and it's easy to assume it's just a small amount of seasoning. But it's one of the most consistently reported triggers for people with histamine intolerance.

For me personally, soy sauce turned out to be one of the biggest triggers I found. I love Chinese food and Asian food in general, and used to eat a lot of it, so this was a real surprise. When I started doing the elimination phase and methodically testing foods, soy sauce kept coming back as the thing driving symptoms more than almost anything else. It was hiding in nearly every sauce and marinade I'd been eating without thinking twice about it.

The short answer

Yes. Soy sauce is high in histamine. It's a deeply fermented product, and fermentation is the primary reason histamine accumulates in it. Soy sauce appears consistently on high-histamine food lists across multiple sources.

The situation gets more complicated when you look at the alternatives people often turn to. More on that below.

Why fermentation makes it so problematic

Soy sauce is made by fermenting soybeans with salt and letting the process run for months. Traditional brewing can take six months to a year. Some varieties are aged even longer. All of that time allows histamine to build up.

How much histamine ends up in a given bottle depends on how it was made and stored, so it can vary between products. But across the board, soy sauce consistently shows up on high-histamine food lists.

It also produces other compounds during fermentation that aren't histamine but can cause similar reactions in some people. So the full effect can be stronger than you might expect just from the histamine content alone.

The tamari problem

When I started my elimination phase, my nutritionist also advised cutting out gluten. So my first instinct was to switch to gluten-free soy sauce, which is essentially tamari. It made sense at the time. It turns out it made things worse.

Tamari is marketed as a healthier, more traditional soy sauce. It's made with more soybeans and little or no wheat, which is why it's gluten-free. But that also means it goes through a longer, more intensive fermentation. Some testing has found tamari samples with even higher histamine levels than regular soy sauce.

Histamine content varies by product and producer, so it's not a guarantee that tamari will always be worse. But it's clearly not a safer option from a histamine standpoint. It's still a deeply fermented soy condiment.

If you have celiac disease or a wheat sensitivity, tamari makes sense for that reason. But if histamine is the concern, switching from regular soy sauce to tamari doesn't help.

Where soy sauce hides

The tricky part is that soy sauce shows up in a lot of places you might not expect:

• Teriyaki sauce: Usually built on a soy sauce base.
• Stir-fry sauces and marinades: Almost universally contain soy sauce.
• Hoisin sauce and oyster sauce: Both use soy sauce or fermented soy as a base.
• Dipping sauces for dumplings, sushi, and spring rolls: Often straight soy sauce or a soy-based blend.
• Ramen and miso-based broths: Both soy sauce and miso come from fermented soy.
• Some salad dressings and vinaigrettes: Especially Asian-style or sesame-based dressings.
• Store-bought marinades and spice packets: Check the label. Soy sauce is common.
• Some soups and stews: Particularly anything with Asian-inspired seasoning.

At restaurants, especially Asian restaurants, the menu might list the main ingredients in a dish without mentioning soy sauce, even when it's there. It's often used as a background ingredient in sauces and marinades without being called out. If you're not sure, it's worth asking the kitchen directly, because the menu description usually won't tell you.

Coconut aminos: the most practical alternative

Coconut aminos are made from coconut blossom sap and salt. The flavor is similar to soy sauce but slightly sweeter and less intense, and they work well as a 1:1 substitute in most cooked applications: stir-fries, marinades, sauces, dipping.

For people with histamine intolerance, the key difference is the fermentation. Some coconut aminos are not fermented at all, just reduced and seasoned. Others undergo a short, mild fermentation. Laboratory testing of certain brands has found very low histamine levels compared to soy sauce. That said, histamine content varies by brand and production method, so it's worth checking how a specific brand is made before committing to it.

This is what we use at home. My wife cooks most of our dinners, and she's Filipino and loves making Filipino and Asian food. A lot of those dishes would traditionally call for soy sauce. Switching to coconut aminos has worked really well. It tastes close enough to soy sauce and my reactions to it are minimal.

Other substitutes worth knowing about

A few other options come up regularly:

Bragg Liquid Aminos: Made from soybeans, but not traditionally fermented. Some people with histamine intolerance tolerate it. Others still react. It's not as consistently well tolerated as coconut aminos.

Low-sodium versions of soy sauce: Still fermented. The sodium reduction doesn't change the fermentation process or the histamine content in any meaningful way.

Homemade seasoning blends: If you're cooking at home, you can build savory depth through other means: fresh herbs, garlic and onion (if tolerated), and salt. It won't replicate soy sauce, but it sidesteps the problem entirely.

Reading labels

When you're checking packaged foods for hidden soy sauce, look for:

• "Soy sauce" (obvious)
• "Tamari" or "tamari soy sauce"
• "Fermented soy"
• "Soybean paste" or "miso"
• "Soy extract" in some products

Products made for Asian cuisine are the most likely place to find soy sauce listed. Some processed sauces, marinades, and seasoning packets don't list the ingredients clearly, so when in doubt, it's worth skipping them.

How to test your tolerance

If you want to figure out where you stand with soy sauce:

1. Complete an elimination phase first. Testing soy sauce while you're still reacting to other things won't tell you much. You need a clean baseline.
2. Start with coconut aminos, not soy sauce. Find out whether you can even tolerate that before working back toward higher-histamine options.
3. If testing coconut aminos goes well, and you eventually want to know about soy sauce, try a small amount in a low-histamine context: plain rice, minimal other ingredients, nothing else that day that could muddy the results.
4. Wait 24-48 hours before drawing conclusions. Reactions can be delayed.
5. Track what you ate and how you felt. Soy sauce often shows up alongside other fermented ingredients, which makes individual reactions hard to isolate without notes.

The bigger picture

Soy sauce is one of those ingredients where the problem isn't just the condiment itself, it's everything it shows up in. A lot of otherwise straightforward meals at restaurants and at home get built on a soy sauce base.

Once you know to look for it, you'll start catching it in places that previously seemed mysterious. That's useful: unexplained reactions that follow a meal with a sauce or marinade often trace back to this. Keeping track of what you're eating alongside how you feel makes that kind of pattern much easier to spot over time.

For meal ideas that skip soy sauce entirely, see our low histamine recipes.

Track your symptoms and discover patterns with Histamine Tracker. Includes a database of 1,000+ foods with histamine ratings.